<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        *{
            padding: 0;
            margin: 0;
        }
        .left{
            width: 160px;
            height: 300px;
            float: left;
            background-color: rgb(14, 179, 179);
        }
        .right{
            width: 300px;
            height: 300px;
            float: right;
            background-color: rgb(26, 219, 42);
        }
        .w{
            height: 300px;
            background-color: rgb(158, 211, 35);
        }
        .son{
            height: 300px;
            margin-left: 160px;
            margin-right: 300px;
        }
    </style>
</head>
<body>
    <div class="left"></div>
    <div class="right"></div>
    <div class="w">
        <div class="son"></div></div>
    </div>
</body>
</html>